1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06f08555ecb8afe0f1866d8d385a5c1f1a7e111238676d98aab94b7b877d69d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6c045b9-a9a5-4c71-b574-cdc706a16193.json and https://artists.proofprofile.net/proofs/artist/e6c045b9-a9a5-4c71-b574-cdc706a16193.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Etta Mae Hartwell - The Best of Blues & Soul – Full Album
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5732a5093cef2ec400cecf1348f92193a6b7fd18eca5ced54c82066dd8f4b69a. Chain 2 (Bitcoin): anchored in block 957680 (2026-07-12T09:07:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNA2526573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bcdecfd2138b1a8682d7081dc7cd330df68f27089b09e3ceec82e064c30b423. Chain 2 (Bitcoin): anchored in block 957680 (2026-07-12T09:07:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNA2526575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dec27f199cfc01b2077d9b00ce20d8c5264498f13c19d8151051a804fd2aff2. Chain 2 (Bitcoin): anchored in block 957680 (2026-07-12T09:07:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNA2526580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd167a2996c9d143763eaea0757788cc5f64d25f01429a76c147cd0495b5c898. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6L2576031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658020fe73e40b5406caa148d40a18c8158ab944d1dd5e8c9abb565c019618aa. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6L2576034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4370413ad3a49b4dee67185449049e13ac8602b71b3fd432b9c4fd033101b257. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6L2576036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfa876f2acc9ca7d9f880cffa51ea841506c2fde0dfd09e8140fe9c974e88d6. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62566094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ff701a79f2b46768ccffd0b13ffcfa46db44d4154fc465cad31cb1e13ea73e. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62566095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9abce1c8490bc5fcba6b30c8fe13592a124d6483e10e6a7459bc9fb6ba3ecb28. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62566096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353434d153a58af23987a6bdcca3bc6afa583057184f28e16fe3c7a2f4c308f1. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62566097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41285236871175f650d3d7a90ab52938f45c24d223c6372166c46f2edf701889. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62566098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4cf138521aea42f590f5c13cd4b20408a9aa75b0680e332d95d1212b5d86297. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB62566102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b621dcce96f2dc1855b62d44479a0b5e9522aef29f5bb8df6a94a4d2593dbb9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3EZ2557616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18da961ae94d3b808307ba93a71a0474f21ef14766ba76640cb6dc8a357d586d. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3EZ2557617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18c65e3222843dc27553d3cfd2694aba1f39a5adf9c6ae70287f41bde38af4e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3EZ2557618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5340be90e649959e301be7d353b0892a6fa4e71e56d71b5b3eaefeb81dd30c54. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3EZ2557620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1791ec871bd478ad773d5eebfb0e8fbd8cc9a14f67764b3f0c9ae2cf63b58026. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3EZ2557621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf592c3a22b5254111cc1dd72e053aecb5032e651bcfd9109a533635de87d9d54. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3EZ2557622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a95519dccdbac7a3ea2697ff6bb6830c2cbf2e47a830f6fa44f1b8b01e921a0. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3EZ2557623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054fc484ba8cdb6e0519d20e9695a1f638a303e5797e31f892cc6e5714c8798b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT3EZ2557624.